Braun has refined the act of shaving through expert engineering and a steely-eyed focus on detail. German engineering applied to the electric shaver has brought forth some of the most superior shaver designs on the market today. Among these innovations have been the Braun Activator, 360 Complete and Contour Pro shavers. Braun 51S Series 5 replacement shaving head foil and cutters (formerly 8000 series) can restore top performance to your electric razor with little effort thanks to their easy-to install design. Your Braun 360 Complete or Activator shaver does a tip-top job day after day easily and comfortably. Your shaving foils are ultra-thin to provide a close shave, but being thin they are also vulnerable to damage and wear. When a hole or dent develops in your Braun shaver foil, it can impact shaving performance, and even cause injury. It is also important to remember, after a time (typically 12 to 18 months), they can begin to dull. You may notice that it takes longer to shave, that you have to move the shaver in more directions, or that it feels like the hairs are being pulled. These signs are a clear indication that it is time to replace your worn heads with genuine Braun 51S replacement shaving heads.